So I've now seen video and stills of several different exploded radios. All appear to be Icom V82s (or something that looks similar). In all but one case, the battery was missing, and the damage to the radio itself was relatively small, adding credence to the hypothesis that the explosion came from the battery pack. I believe the battery form factor is common to a number of Icom models, including the current ones. So possibly what was compromised was a shipment of replacement batteries.